Okay I have the forum for over a year now and have started posting but I have yet to come across this question. Mod’s please help me here.

Will drilling holes in a barrel similarly patterned to what they do to Paintball Guns help, hinder, or be totally non-effective in the performance, accuracy, and distance of the ammo?I hope I was clear. Here is a picture of what I mean.

And yes I have the patience to duplicate the pattern..

Heres a google image search of what I am talking about...

EDIT: Sorry for the $30 Clearence -IGNORE THAT! I pulled the image of google

One of the beneficial effects of the holes for a paintball gun is playing woodsball when it's cold. It allows some CO2 to escape the sides and doesnt make as much of a cloud of condensation. This is useful for when you don't want to be found. In a potato gun, I really can't see any benefit.

Yeah, some paintball guns (like most Spyders) are running at 800 PSI, the pressure of the CO2 in the tank. And our combustions will only be making like what, 100? And (most of) our pneumatics aren't going to be safely running at anything over, maybe 200 if they are home made, or 100 or so if you are using a sprinkler valve. The porting will probably just make you lose pressure behind the projectile, and thus velocity. But, if you have the time, and are willing to take the risk, I'd say to go for it. Do it on like a 1inch barrel though so you won't be out as much if it fails.If you have access to a chronograph, I would love the see the data if you did this.

Ok great e/o thanks for the feed back. My brother is a Master Plumber so I just raid his backyard for parts and pipes I only pay for sprinkler valves and my own time which is very limited (I work full time, 2 kids and law school at night)

I finish semester May 8th and I get off from work the whole summer. I will definitely let you know how it goes as I was/am planning on spending my summer building Paintball mortars, rolling cannons, landmines all for woods ball. To use over the summer.

(Anyone from So Flo here - join me in E.R. this summer

When I get the specs I will be happy to chart the specs using the chrono from the Paintball field.

Sorry to start the topic and not come through. I wanted to hear feed back before I started. This is what gets me through the day

I can't think of a mechanism<sup>1</sup> by which those ported barrels would induce spin - and even then, it's not going to be enough to matter<sup>2</sup>.

That said, porting a spudgun barrel is generaly going to allow the barrel pressure to get much closer to the atmospheric pressure before the projectile leaves the barrel.This will generally<sup>3</sup> decrease velocity by decreasing the average force on (and therefor acceleration) of the projectile, but will probably increase accuracy<sup>4</sup> by mitigating the effect of the muzzle blast<sup>5</sup>.

1) Not that that means there is no such effect.2) Your average potato has to rotate 360<sup>o</sup> once every 40 to 200" (depending on velocity, mass, and diameter) of flight to be stable.3) If your barrel is too long to begin with, such that the barrel pressure goes below the atmospheric pressure, it'll actually increase performance by decreasing that <i>harmful</i> pressure difference... but not as well as just making the barrel shorter.4) I suspect that muzzle blast isn't really that much of a factor in spudgun accuracy, so this effect probably won't be terribly large in most cases. (I suspect barrel vibrations and tumbling projectiles are the main culprits)5) This will also reduce the loudness and gun-sound-like-ness of the 'boom'.